Armchair



FIG. 1 is a top view of an armchair showing my new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a perspective view thereof; and,

FIG. 7 is a rear view thereof.

The portions of the design in broken lines are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for an armchair, as shown and described. 